(Computrac) 3000 Block2 User`s Manual253262
Contents
1. INSERT UNTIL 4 When prompted with TRANSPORT AND INSERT UNTIL insert the sample bottle into the heater 5 This test will run for 15 minutes to purge moisture that may have migrated into the system e Ifthe result is more than 100ug repeat the System Purge e Ifthe result does not fall under 100g after the 3rd or 4th test Ensure the slick side of the septum is to the inside of the sample bottle e Check and or change the hydrophobic filter see page 34 e Call AZI Customer Service at 800 528 7411 or 602 470 1414 Page 10 The water calibration test verifies that the instrument is working properly This test only takes a few minutes Arizona Instrument recommends that e This test be run every day to verify the system s calibration and accuracy and The syringe be returned for calibration annually or if damage is suspected e The syringe be cleaned with acetone before storing it away after each day s use The information presented here will help you perform the test described on the next page The syringe uses the volume inside the needle as its calibrated quantity It is important to eject any trapped air to properly fill that volume Insert the syringe needle through the septum of a sample bottle of clean water distilled or de ionized water Rapidly depress the plunger all the way and observe the needle tip for small bubbles If any appear repeat the cycle until none appear e To reproducibly inject 0 52. These specifications are intended as a guide to proper use of the instrument Specifications and features will vary with application AZI product specifications are controlled by ISO 9001 procedures and are established and verified during design They are not to be construed as test criteria for every application Refer to AZI document Number 4C04 0001 for current specifications controlling this instrument All specifications and features are subject to change without notice Periodically contact Customer Service to see if any upgrades are available for your instrument Dimensions Weight Power Ratings Environmental Requirements Heating Range Resolution Special Service Carrier Gas Rear Panel Connections Side Panel Connections Detection Limit Repeatability Accuracy Automatic Test Ending Method Approximately 146 mm X 380 mm X 370 mm Approximately 8 6 kg 19 Ibs 110 10 volts 50 60 Hz 1 amp standby or 8 amps heat on or 210 10 volts 50 60 Hz 0 5 amp standby or 4 amps heat on 5 to 40 C 0 to 80 RH non condensing indoor use Optimum results are obtained from 20 to 40 C 25 C to 275 C electronically controlled 1 microgram 1 ppm 0 0001 water in sample Dry nitrogen or dry air 40 C dew point or lower is suggested at 7 to 12 psig user supplied Parallel printer port PC standard 9 pin RS 232 9600 N 8 1 9 pin Balance Comm proprietary protocol and cable Power ca
3. INTA L 4 ma Instrument LLC USER MANUAL COMPUTRAC VAPOR PRO 3000 MOISTURE ANALYZER BLOCK 2 OPERATION MANUAL Firmware Rev 2 00 February 1999 ARIZONA INSTRUMENT LLC 3375 N Delaware Street Chandler AZ 85225 USA 800 528 7411 602 470 1414 f 602 281 1745 www azic com Email General azi azic com International intl azic com Customer Service supportO azic com ARIZONA INSTRUMENT LLC 3375 N Delaware St Chandler AZ 85225 800 528 7411 sales azic com www azic com MADE IN THE USA AZI P N 700 0020 C1 Last update February 1999 Computrac 3000 PROPRIETARY RIGHTS NOTICE The material in this manual contains valuable information developed by Arizona Instrument for use with the Computrac line of moisture analyzers No part of this manual can be reproduced or transmitted in any form or by any means electronic mechanical or otherwise This includes photocopying and recording or in connection with any information storage or retrieval system without the express written permission of Arizona Instrument LLC ALL RIGHTS RESERVED Copyright 1999 Arizona Instrument LLC Page 2 Table of Contents INTRODUCTION ici Gage ied wee a ed ake eed ee ee ae Page 4 PRINCIPLES of OPERATION 00 c eee eee eee ene Page 5 UNPACKING Sai ia Beit Oe ea Fae a Rat Page 6 INSTALLATION 25 teed sett eee ha eee hae ae eed Page 7 Check Sensor Status 0 0 0 cece nee Page 9 System PULSE ai Da A A RL AAA
4. EN Es Page 10 CALIBRATION TESTS o Terria a eens Page 11 Syringe Technique 0 cece tenes Page 11 Calibration Check n 0 ccc eee Page 12 Sensor Calibration s saa n E a eee Page 14 RUNNING MOISTURE TESTS oa ein red cece cece a s Page 16 Select Test Settings ia ese fee we ee ERE EE a a e Page 16 To Enter Material Name 20 0 0 naea Page 16 To Set Programmed Test Temperature 000000 Page 17 To Select Units for the Final Result Display Page 18 To Select How to End the Test 0 0 00 Page 18 Run Moisture Test ein aa dada Page 21 COMPUTRAC 3000 MENU SYSTEM 00 0 e eee eee eee eens Page 22 MEMORY START MENU 0000 cece eee ee eee Page 24 STORED DATA MENU E cece E eee ens Page 24 CALIBRATION MENU 00 0 i cece eee eee Page 24 SETUP MENUV 1 A TAS Page 25 DIAGNOSTIC MENU e EE eee Page 26 CONDITION PROMPTS and SYSTEM FAILURE CODES Page 27 Condition Prompts 20 0 0c eee teen eee Page 27 System Failure Codes eros 0 0 eens Page 29 COMMONLY ASKED QUESTIONS 00 0 0 cece eee eee ee Page 30 REPAIR AND MAINTENANCE 00 0 e cece cece eee nee Page 33 APPENDIX A SPECIFICATIONS AND RATINGS 005 Page 43 Page 3 Arizona Instrument is proud to continue its leadership developing new technology in the moisture analysis industry The Computrac 3000 has been recognized by R am
5. should be rounded down and a value of 88 used in the next few steps x 100 Flow In FCF 24 Escape to the Main Menu and select in order e Calibration Menu e Edit System Cal Constant 25 Edit the Flow In Transducer Value to the EDIT SYSTEM CAL CONSTANTS calculated Flow In FCF FLOW IN XDUCER 883 x FLOW OUT ZDUCER 892 x 26 Escape to the Main Menu BY eae ee eee RH SENSOR U75 3 388 U SYSTEM CAL 188 Quit Left Right Incr Decr Page 40 27 Select Diagnostics Menu 27 1 Select View System Sensor Status e Verify that the indicated Flow In value agrees with the Indicated Flow Out value within 2 ml min e Ifit does not Adjust the Flow In FCF value in the Edit System Cal Constant Menu so that the Flow In and Flow Out Indications in the System Sensor Status Menu are equal 2 ml min 28 Press Esc to the Diagnostics Menu 28 1 Select in order e Manual Flow Control Off 29 Check and if necessary adjust the RH Sensor calibration see page 12 O How do I set up the Computrac 3000 to use the AZI SP150 or SCI SA800 digital balance A Follow the steps below 1 Beginning at the Starting Screen select the prompts in order e Main e Setup Ext Balance setup e Select Balance Driver SETUP MENU CLOCK SETUP EXT BALANCE SETUP EXT PRINTER SETUP REPORT SETUP ACCESS KEY SETUP SEPTUM RECORD SETUP EXT BALANCE SETUP SELECT BALANCE DRIVER SELECT TARE MODE CHECK BALANCE COMM Esc Sel
6. 11 syringe which has been calibrated to 5ul with the exact weight in ugrams clearly visible will be used for this calibration or an NIST traceable syringe set to 5ul 500ug This syringe has a very small barrel and piston which must be properly cared for to assure a correct injection is delivered to the instrument After use the syringe must be cleaned with acetone and stored in a desiccant box or it will become immobilized internally Clean the syringe by placing the needle in acetone operating the plunger several times at least three and storing it with the plunger all the way in Once the syringe has become immobilized it should be replaced The syringe should be returned to AZI annually for calibration or if damage is suspected Contact AZI Customer Service at 800 528 7411 or 602 470 1414 to obtain a Return Material Authorization RMA number and prompt replacement AZI Part Numbers of most used items gt SEPTA Injection Port FILTER Hydrophobic BOTTLE Sample Black top only SYRINGE 1uliter calibrated to 0 Suliter SEPTA Sample Bottle 1 When READY TO TEST is displayed on the Main Test Screen SELECT IN ORDER e Memry e RHSENSOR CAL 2 Prepare the Syringe with distilled or deionized water e Insert the syringe into the water bottle and fill the syringe e Rapidly depress the syringe s plunger to expel any air in the barrel e Fill the syringe and hold the plunger against the stop e Remove the syrin
7. Esc Selct Down Figure 5 Diagnostic Menu 5 Adjust the nitrogen source pressure if necessary SENSOR STATUS but not to exceed 12 psi so that the Flow in and RH_SENSOR 461 675 x RH Flow out rates are both at the optimum setting of o 1an E a 100 ml min 10 ml min NOTE that the flow MAN RID 668 C t d ahtis hoher tiem i BOTTLE RID 636 C out may read slightly higher than the How in RH RID AVi C e Ifthe suggested rates are not obtained see H20 FLOW B601 1 ug Sec How do I Calibrate the Flow Sensors on FLOW MODE STDBY Esc Units Figure 6 View Sensor Status Screen page 38 6 Return to the Main Test Screen by pressing Esc three times Page 9 System Purge NOTES For all tests using a bottle the bottle should not be moved into the heater until a screen prompt appears directing that the bottle be inserted If the bottle is moved in too soon it may be ejected and the test results affected ENSURE the slick side of the septum is to the inside of the bottle or the moisture trapped in the septum will cause false moisture indications When the display indicates Ready to Test 1 From the Main Test Screen select in order e Depress Memry System Purge A RH SENSOR CAL TO BEGIN PRESS START 2 PREPARE a new clean and dry sample bottle to be positioned into the heater during the next set of steps 3 PRESS START Figure 7 Select System Purge PLACE SAMPLE BOTTLE IN
8. SED WHILE TESTING This prompt results from premature release or ejection of the sample bottle during a moisture test Failure of the transport latch is the most likely cause If this condition persists call the Arizona Instrument Customer Service Department at 800 528 7411 or 602 470 1414 6 BALANCE COMM FAILURE This prompt indicates that the memory start used specifies use of a digital balance for weight entry but the instrument is not communicating with a balance Check the cable and assure that the balance is powered on on line and stable Page 28 S te F h Occurring less frequently than condition prompts system failure codes require the instrument to be switched off and then powered back up It is possible for a failure to occur due to a transient condition However if the failure persists or occurs frequently call Arizona Instrument Customer Service at 800 528 7411 or 602 470 1414 a ERROR MESSAGE TEXT MOST LIKELY CAUSE e RHRTD RANGE ERROR CABLEORRTDFAI o RHRTDRATEERROR MANOLO HEATER Page 29 Below are some commonly asked questions with answers and possible solutions O What if my water injection results are zero or near zero Figure 20 Correct Placement Figure 21 Incorrect Placement A Make sure the syringe is being inserted all the way into the injection port Q What if my water injection results are out of range A Perform a sensor calibration
9. The Computrac 3000 self adjusts the internal calibration factors to the high precision moisture sensor due to varying conditions temperature product accumulation in the flow system component wear etc Over time this may cause the overall calibration to drift slightly Since sensor calibration is easily performed daily verification is recommended O How do I prevent the syringe from freezing up Clean the syringe in acetone before storing it at the end of each days use The water collected in the small barrel of the syringe may not be seen but it is enough to cause the piston to jam against the barrel when it dries out or causes corrosion The use of deionized water does not prevent corrosion and does not ensure other contaminants do not enter the syringe Before storing the syringe for over 12 hours clean the syringe by the following method Insert the needle into acetone Work the plunger up and down at least three times Depress the plunger all the way into the syringe and While holding the plunger all the way in remove the syringe needle from the acetone and store the syringe in a box with desiccant YVVY Page 30 O How do I dry the instrument after an upset A Incase the instrument has been flooded with moisture either by running a very wet sample or by exposure to a wet atmosphere it will be necessary to dry the entire flow system before normal operation can be resumed 1 Inspect the filter tubing the n
10. The flow meter reads 100 while the instrument display 10 0 reads 109 for flow out The result of 91 7 should be rounded up ina X 100 91 7 a 109 and a value of 92 used in the next few steps Page 39 17 Escape to the Main Menu and select in order EDIT SYSTEM CAL CONSTANTS Calibration Menu FLOW IN XDUCER 188 x e Edit System Cal Constant FLOW OUT XDUCER 093 x RH SENSOR UA 0 700 R RH SENSOR UYS 3 368 18 Edit the Flow Out Transducer Value to the SYSTEM CAL 100x calculated Flow Out FCF Quit Left Right Incr Decr Figure 32 Editing the Flow Out FCF 20 Select View System Sensor Status SENSOR STATUS i indi i i RH SENSOR 66 675 x RH Verify that the indicated Flow Out in ml min cig iH ia now agrees with the measured flow rate on FLOW OUT 1986 mL Min the flow meter within 1 ml min ae 19 Escape to the Diagnostics Menu it RH RTD B71 C H20 FLOW B001 1 ugrSec 21 If they do not agree edit the Flow Out FLOW MODE STDBY Transducer value to 100 and REPEAT steps 6 Te Units IT through 20 Figure 33 Check Indicated Reading 22 WHILE AT THE VIEW SYSTEM SENSOR STATUS MENU Read and record the Flow In value 23 Divide the Indicated Flow Out reading by the Flow In reading and multiply the result be 100 to obtain the Flow In FCF Value Indicated Flow Out Rate Indicated Flow In Rate 23 1 Example The instruments flow out reads 100 while the instrument 100 flow in 113 The result of 88 4
11. ate operating conditions that prevent starting or completing of a moisture test Following each condition prompt are possible causes and recommended solutions 1 EXCESSIVE IN OUT FLOW RATIO This prompt indicates that the carrier gas flow out of the instrument is less than 90 of the flow into the instrument suggesting a leak Particle caught between cap and Clean bottle rim septum 2 INPUT CARRIER GAS FLOW LESS THAN 40 mL Min This prompt results when the source flow into the instrument falls below the specified rate Source connected to flow out barb Connect to flow in barb Flow sensor failure Call Arizona Instrument Blocked Needle Check that bottle septum is not blocking needle port Page 27 3 THE RH SENSOR WAS NOT READY This is a normal condition between tests indicating the drying or zeroing of the sensor If the condition persists for more than a few minutes then Possible Cause Recommended Solution Flow system contaminated Locate and eliminate contamination System unusually wet Wait for system to dry Install change external desiccant Wet source gas chamber 4 SEPTUM CHECK WARNING The septum at the calibration injection port has experienced 60 or more water injections and may be in danger of losing its core into the flow system Change the septum and reset the counter by selecting SETUP MENU from the MAIN MENU then SEPTUM RECORD SETUP then Go 5 BOTTLE RELEA
12. ation monitors moisture loss from the sample to extrapolate the final moisture concentration and provides the quickest test times Time ends the test when the programmed testing period has elapsed The test will end when a selected amount of time has passed Any value from 001 to 999 minutes may be entered Fixed time ending is seldom superior to the predict calculation but is useful when conducting application characterization tests or when investigating long term stability of the instrument Page 18 14 Ifyou are attempting to match KF analysis results find out what sample size and sensitivity setting was used in the KF procedure Use approximately ten times as much sample in the Computrac 3000 and set the rate ending criteria value to ten times the sensitivity value used in the KF equipment Example KF Sensitivity Setting KF Sample Size 0 1 ug sec 0 5 grams Computrac 3000 End Rate Computrac 3000 Sample Size 1 0 pg sec 5 grams 15 Ifyou do not have the KF parameters available perform the following experiment 15 1 Select a sample size that will yield 500 to 1000 micrograms of water or use the table below 005 015 50 150 ppm 015 035 150 350 ppm ee 075 150 0 5 1 gram 150 350 0 2 0 5 gram 350 750 0 1 0 2 gram 750 1 5 0 05 0 1 gram 15 2 For best accuracy and speed the sample should evolve between 500 and 1000 micrograms of water during the test Larger amounts will not significan
13. ble receptacle with RFI filter Carrier gas input barb fitting Carrier gas exit barb fitting PC keyboard DIN socket 10 micrograms 1 standard deviation Depends on sample properties and syringe technique typically CV is lt 10 Depends on sample properties and syringe technique typically error is lt 10 Rate Threshold user adjustable Time user adjustable Prediction Page 43 Accessory Kit One 1 0 microliter calibrated syringe 990 0068 Ten each 20 mililiter sample bottles with septa and caps 990 0064 One hydrophobic filter 990 0059 Two injection port septa 990 0058 Replacement sample probe 990 0057 User s Manual 700 0020 Power cord for 120 volt use 200 0002 Optional 101 key PC keyboard 990 0088 Accessories PC graphics printer Y990 0098 Digital balance with cable and Y 990 0082 Communications Software Travel case 990 0092 Dry air generator 600 0169 Warranty Instrument is warranted for two years against defects in material or workmanship Consumable and routine maintenance are not included in the warranty Contact Customer Service for AZI annual maintenance contract information US Patent No 5 712 421 US and Canadian Underwriters Laboratory European Communities CE Foreign Patents Pending Arizona Instrument is an ISO 9001 company Page 44 TRADEMARK AND COPYRIGHT PROTECTION Computrac Arizona Instrument and the stylized AZI are all registered trademarks of Arizona Instrument LLC Instrument firmware i
14. ct Up Down Esc Selct Down Figure 35 Setup External Balance Figure 36 Select Functions 2 Select the AZI SP150 or SCI SA800 according to the balance you have e Select Quit e Select Accept Page 41 3 Select Tare Mode SELECT TARE MODE e Fixed Bottle Weight if all sample bottles a O FIRED BOTTLE WEIGHT weight exactly the same MANUAL BOTTLE WEIGHT e Manual Bottle Weight if all bottles are pre WEIGH EMPTY BOTTLE weighed by hand e Weigh Empty Bottle if the balance is to tare weigh each bottle before it is filled with sample Esc Selct Up Down Figure 37 Select Tare Mode 4 Escape ESC to the Ext Balance Setup Menu 5 Connect the cable between the Computrac 3000 Balance Input and the balance RS 232 Connector 6 Turn the balance power on and wait for the ready indication 7 Select Check Balance Comm on the Ext EXTERNAL BALANCE CHECK Balance Setup Menu a TURN BALANCE ON e Select Go and wait for communication to be MAKE SURE COMM CABLE IS established CONNECTED TO PORT 1 e Ifthe check is bad verify each step above HIT GO WHEN BALANCE IS READY Figure 38 Balance Communication Check e Ifthe check indicates good communication a RAMA a weight will be shown on the Computrac 3000 display CHECKING BALANCE COMM 8 Ifthe check is good press Esc until the Main Test Screen is displayed If not recheck the cables and setup conditions Figure 39 Oval at bottom will show weight when communication good Page 42
15. d 2 Connect the dry gas supply tube to the Instrument s Inlet Port 3 Connect the Instrument s Outlet Port to a calibrated Flow Meter s Inlet Port 4 From the Main Menu Select in order e Calibration Menu EDIT SYSTEM CAL CONSTANTS e Edit Cal System Constants FLOW IN KDUCER 18 x FLOW OUT KDUCER 188 x RH SENSOR UG 6 700 U 5 Edit the two values Flow In and Flow Out to read RH SENSOR U75 3 308 U 100 SYSTEM CAL 1687 6 From the Main Menu Select in order Quit Left Right Incr Decr e Diagnostics Menu Manual Flow Control Figure 29 Editing Calibration Value gt BOTTLE PURGE to allow maximum flow then gt STANDBY to allow flow regulator adjustment 7 Turn the instrument off and remove the power cord from the source of power CAUTION Line voltage is present under the instrument s cover To prevent electrical shock turn off power and remove the power cord when instructed to do so Do not connect the power cord and turn power on until after the cover is secured in place 8 Insert a small screwdriver or other probe into the latch release hole at the back near the top of the instrument and remove the lid See Figure 22 on page 33 for release location Store the lid in a safe place 9 Reach through the opening at the top of the instrument and release the two catches at the top rear inside the instrument See Figure 30 on Page 39 for latch locations This releases the plastic cover from the me
16. d numeric values may be entered Page 23 e ADD EDIT MEMORY STARTS gt Sets the values for stored test parameters The parameters are stored by name Values are stored for test temperature ending criteria method of entry of sample weight and bottle purge control e REORDER MEMORY STARTS gt Allows the list of stored parameter sets to be rearranged It also deletes sets no longer needed or copies existing sets to another location using the cut and paste method e PRINT MEMORY STARTS gt Prints a list of the stored parameter sets on the attached printer or to an attached computer See Printer Setup and Report Setup Report Content to arrange the instrument for this purpose e VIEW STORED DATA gt Allows viewing and printing of all data stored for a given test e ANALYZE STORED DATA gt Permits selection of stored data sets for statistical analysis Statistical analysis includes mean standard deviation S D and coefficient of variation C V e REORDER STORED DATA gt Rearranges the order of the list of stored data sets It also deletes sets no longer needed or copies existing sets to another location using the cut and paste method e DELETE STORED DATA gt Facilitates deletion of selected data sets Selection by line date or all items e PERFORM RH SENSOR CALIBRATION gt To be used carefully and only when required to calibrate the moisture sensor When this selection is made the stored data sets and th
17. e calibrated syringe volume are used to calculate and execute the automatic adjustment of the instrument calibration constant e EDIT SYSTEM CALIBRATION CONSTANTS gt This selection allows the entry of the two sensor constants written on the sensor card when a flow manifold is replaced and the adjustment values to calibrate the flow sensors gt VIEW CALIBRATION STATUS gt This selection allows review of the calibration status and activity of the RH sensor automatic sensor zero adjustments system purge dates and background moistures and flow transducer adjustments Page 24 gt PRINT CAL REPORT gt Prints all calibration status reports e CLOCK SETUP gt Sets the internal clock for the correct time and date e EXT BALANCE SETUP gt Identifies the type of external balance AZI SP150 or SCI SA80 gt Selects the tare mode fixed or manual bottle weight entry or balance entry and gt Verifies the communication link between the instrument and balance EXT PRINTER SETUP gt Identifies the type of data printer used and specifies where the output data is to be sent RS 232 LPT or both e REPORT SETUP gt Report Control specifies when the report is to be printed off at the start at the end selects the output format text or spreadsheet specifies the reporting interval in seconds turns on or off end of line automatic formfeeds selects which graph to print both rate result none and turns lot number recordin
18. e content in the sample The instrument then displays the result in terms of e Parts per million ppm H O e Micrograms ug H O or e Percentage H O Dry Air In a SRR a A A amp a E og GE W2 SA Flow Manifold Transducers Dry Air Out Figure 1 Computrac 3000 Basic Flow System The main sensor used to detect water in the gas stream is a polymer capacitor relative humidity sensor The reading from this sensor is combined with manifold temperature and outlet flow rate to determine absolute micrograms of water per second Test parameters such as temperature ending criteria and sample weight entry can be changed to optimize test speed and accuracy See Appendix B beginning on page 43 for detailed specifications and operating limits Page 5 Unpack the instrument and locate the following items AZI P N e Computrac 3000 e Line cord for 120 VAC 200 0002 e Accessory Kit Y990 0063 gt One 1 0 ul Hamilton Syringe 990 0068 gt Ten 20 ml Sample Bottles with 990 0064 Septa and Caps gt One Replacement Sample Probe 990 0057 gt Two Injection Port Septa 990 0058 One Hydrophobic Filter Disk 990 0059 gt User s Manual 700 0020 gt Power Cord 200 0002 Optional Items e Balance with interface cable Y990 0082 e Printer Y990 0098 e 101 key keyboard 990 0088 e Dry Air Generator 600 0169 If you are unable to locate any of the standard items or have questions regarding the optiona
19. e power source is properly grounded Never cover the power receptacle so that the power cord can not be removed quickly and easily 7 Toggle the power switch at the rear of the unit to the ON J position Page 7 8 After a quick view of the instrument identification and the firmware version the Main Test Screen will appear OFF 6271971998 13 52 33 Data from the T Last Test L 980000 PPM H20 Y a oTAL 8000 0 ug H20 Current Oven TIME 66 66 66 Temperature Current Sensor RH SENSOR CAL Status SELECTS PRESS MEMRY READY TO TEST 825 To Select Another Memry Menu Graph Set of Stored Test Parameters View Test s Graphical Data To Access the Main Menu Options Figure 3 Main Test Screen 9 Allow the instrument to warm up for 20 minutes Page 8 Check Sensor Status From the Main Test Screen select Menu to reveal the Main Menu Use the buttons below the display on the front panel to move through the menu screens and system settings 1 Move the cursor down to highlight the Diagnostic MAIN MENU Menu MEMORY START MENU STORED DATA MENU CALIBRATION MENU 2 Press Selct SETUP MENU DIAGNOSTIC MENU Esc Se lct Up Figure 4 Select Diagnostic Menu 3 Verify the View System Sensor Status option is DIAGNOSTIC MENU highlighted VIEW SYSTEM SENSOR STATUS MANUAL FLOW CONTROL MENU VIEW SYSTEM EXCEPTIONS 4 Press Select again to view the Sensor Status PRINT EXCEPTION REPORT Screen
20. eedle and mount to be sure that no contaminants are present that might absorb and release large quantities of water If contamination is present replace the contaminated parts with new parts 2 Confirm that the carrier gas supply is dry If there is any doubt about this employ a drying cylinder in line with the gas supply before connecting it to the instrument gas input fitting 3 Begin drydown of the system Place a clean dry sample bottle ensuring that the slick side of the septum is to the inside of the bottle in the transport Go to the memory start list and select SYSTEM PURGE Start the test and insert the bottle Periodically examine the rate graph display and see if the moisture rate is falling If it remains at a very high level until the end of the test a source of water is present in the system and must be removed before dry down will succeed Normally the rate will begin to decline after a short time and eventually will fall to less than 1 pg sec When this occurs a READY TO TEST message will appear on the display and testing can resume O What about interferences O What is good syringe technique A Good syringe technique is essential to accurate calibration The syringe uses the volume inside the needle as its calibrated quantity It is important to eject any trapped air to properly fill that volume Insert the syringe needle through the septum of a sample bottle of clean water distilled or de ionized
21. g an RMA number return the damaged syringe to AZI for repair service O Why do my tests sometimes end in less than 2 minutes A A This is usually caused by an inappropriately large rate ending criterion value Recall that when using the rate ending criterion you entered a rate value to end on If the sample moisture is very low or the sample is too small the peak rate never exceeds the ending rate and the instrument concludes that the test is over To rectify this use a larger sample or a lower ending rate value See To Select How to End the Test beginning on page 18 How do I transfer stored data to a computer file To store archival information in a computer text file before deleting it from the instrument memory set up the instrument to print to the RS 232 port Setup Menu External Printer Setup Go to Setup Menu Report Setup Report Control and select text output Go to the screen showing Print and select the report to be printed Set up the computer to receive text information into its serial port at 9600 baud no parity 8 data bits and 1 stop bit 9600 N 8 1 Windows Terminal or Windows 95 Hyperterminal are good choices for this purpose DOS users should use Procomm or Terminate or equivalent utilities Consult the documentation for your communications program for details on how to save input data to a file How do I print to a printer To print test results or stored data Connect the pri
22. g on or off gt Report Content specifies whether particular items of information are to be included in the report or not These items are Memory Start Number Memory Start ID Text String Lot Number Product ID Text String Test Date and Time Final Result ppm or Final Mass micrograms H20 Ending Criterion Sample Weight Test Time Test Temperature Ending Rate micrograms sec at end of test Peak Rate Peak time Time Tau Flow In Flow Out Manifold Background System Background gt Edit Company Name allows you to change the company name that prints on the header line of the report Page 25 e ACCESS KEY SETUP Allows entry of the secret access codes used to prevent unauthorized alteration of stored parameter sets or stored data sets The master key controls all functions The Params key controls memory start parameter list access e SEPTUM RECORD SETUP gt This function resets the injection port septum counter When the septum has been used 60 times a message will warn the operator to replace it When the replacement is accomplished use this function to reset the count to zero e VIEW SYSTEM SENSOR STATUS gt Displays RH sensor value flow in and out manifold temperature RTD bottle heater temperature RH sensor temperature H O flow rate and instrument flow mode e MANUAL FLOW CONTROL MENU gt This menu allows manual control of the carrier gas flow mode for test and analysis of possible system faults There are five
23. ge from the bottle 3 Press START 4 When the INJECT WATER NOW prompt flashes on the display IN ONE CONTINUOUS MOTION gt Insert the syringe into the instrument to the stop gt Rapidly press the plunger down and gt Remove the syringe Page 14 5 When the instrument again indicates READY TO TEST perform steps 2 through 4 at least four 4 more times or until a total of five 5 valid results within 10ug of each other are obtained 6 When the five tests results are available press Menu and the Main Menu Screen appears 7 Select the Stored Data Menu 8 Select Analyze Stored Data and review each test e Valid tests should be within 10 ugrams of each other e Select the five closest results NOTE At least five 5 valid tests are required for the proper analysis and correction factors to be calculated If five valid results are not available repeat the tests until they are available 9 Depress STATS e Review the results of the calculation Standard Deviation should be less than 10 e Coefficient of Variation should be less than 2 e Depress Esc 3 times to return to Main Menu 10 Select Calibration Menu 11 Select Perform RH Sensor Calibration 12 Press Selct Down and Selct to select all calibration tests to be included in the calculations 13 Press Cal The screen will display the calibration water mass Edit it to match SAMPLES 05 the notation on the syringe MEAN 0519 7
24. igure 13 Fully Depressed Position 1 Remove the one microliter syringe from the box CPUC Vee AY OFF The syringe has been factory set to a wae SN a eo approximately 500ug The actual calibration 061 6 uy H20 value is on the calibration certificate TIME 66 61 66 e Follow the previous instructions to load the TEST SES ee syringe with a sample of distilled or de ionized eh 113 water Memry Menu Graph AS Figure 14 RH SENSOR CAL 2 Ensure that the TEST prompt on the main screen g Displayed reads KRH SENSOR CAL If not press Memry and move the cursor up to highlight RH SENSOR CAL e Pull the plunger past the 0 5 uL graduation while the needle is immersed in the sample The rod which goes through the lower Chaney fitting by the flange will be drawn through the hole in this fitting Refer to the section Syringe Technique on page 11 as needed Page 12 e Squeeze the silver button on this lower Chaney fitting to close the hole e Depress the plunger until the rod touches the closed hole in the lower Chaney fitting This should be 0 5 uL as a hard stop e To prevent loss of water from the syringe by capillary action do not touch the needle tip to anything until it is inserted into the calibration port of the instrument e Press the START key on the Computrac 3000 It is important to begin the test promptly since the water will evaporate out of the syringe needle Almost immediately the screen will display
25. igure 24 Injection Port Septum and make sure everything is properly Location aligned and secure 4 Replace the top cover and power cord 5 Turn the instrument on and the instrument is ready for normal use Page 35 Q How Do I Replace a Contaminated Manifold A This is a simple procedure First obtain a replacement manifold assembly Call AZI Customer Service at 800 528 7411 or 602 470 1414 for a replacement Turn off the instrument and disconnect the dry air gas source at the back Remove the power cord and store it nearby Insert a small round object into the Lid Release opening in the back of the instrument and press in until the lid can be lifted up Lay the lid aside The manifold is now visible in the center of the opening Wait 20 or 30 minutes to allow the manifold to cool for safe handling When the manifold is cool to the touch separate the two halves of the manifold heater conncetor visible above the top and to the left of the manifold Rotate the dogear latches of the sensor connector outward and remove the cable connector from its socket Located below the heater connector bros Heater Come ctor Figure 26 Manifold Connectors and Latches Carefully slide the solenoid valve ribbon cable off the valve pins pulling it toward you until it clears the pins Reach down and behind the manifold at the right end to pull up the over center latch lever until it releases You may need
26. l accessories please contact AZI Customer Service at 800 528 7411 or 602 470 1414 Page 6 2 Place the Computrac 3000 on a solid level surface that is large enough to accommodate the instrument and any accessories or materials that may be required for your work balance printer sample bottles samples etc og ES a Arizona t _STED E MODEL FCT 00 cram C se l ES REPLACEMENT FUSES 11DVAC SASB 220VAC 4ASB Figure 2 Rear Panel of the Computrac 3000 3 Using 1 4 formulation 2075 Tygon tubing AZI P N 345 0050 attach a dry nitrogen or carrier gas source to the Flow Inlet Port fitting on the back of the instrument indicated by an arrow pointing to the connector 4 Adjust the source pressure to between 7 and 12 psi 5 If you plan to use a printer electronic balance and or computer connect them to the marked connectors at the back of the instrument The accessory keyboard plugs into a fitting on the right side of the instrument 6 Power control and fuses are located at the rear of unit Plug the instrument line cord into the matching port on the back of the instrument and a dedicated 110 VAC 60 Hz 15 Amp line source Never use any power cable other than the one provided or of equivalent UL listed ratings Be sure that the ground pin of th
27. l AZI Customer Service at 800 528 7411 or 602 470 1414 for a replacement 1 Remove the power cord from its socket CAUTION Line voltage is present under the instrument s cover To prevent electrical shock turn off power and remove the power cord when instructed to do so Do not re connect the power cord and turn power on until after the cover is secured in place 2 Inserta small probe into the hole at the back of the instrument It is marked by a graphic symbol indicating the method of opening the top cover see Figure 22 on page 33 Push inward to release the safety catch and lift the top cover up with your free hand Remove it and put it in a safe place Hydrophobic Filter Disk 990 0059 3 The filter will be found near the right center on top of the manifold assembly Pull the flex tubing off the top of the filter l CW to Install disk Rotate the filter disk Y turn counterclockwise and lift it off Discard j i the old filter and replace it with a new one Reattach the flex tubing If condensed material is visible in the flex tubing replace _ the flex tubing Note that this is a special Figure 23 Filter Disk Location type of hydrophobic tubing The proper tubing is available from AZI as AZI Part Number 345 0050 E uN CCW to Remove 4 Replace the top cover and power cord 5 Turn the instrument on and perform a SYSTEM PURGE See page 10 6 When the purge process concludes the i
28. ld Be hat careful not to contact the bottle heater Fe rim as it may be hot enough to cause a burn Examine the filter and flex tubing BALANCE O gt ee Fi 22 Rel Locati If a deposit or discoloration is observed ee eee in the flex tubing between the filter and the manifold the filter and tubing should be replaced and the entire sample flow path cleaned with isopropyl alcohol US IMPORTANT El Never use methanol for cleaning any part of the instrument Methanol interferes with calibration of the RH sensor and is very difficult to remove once introduced into the flow system Page 33 The Hydrophobic Filter on top of the manifold is expected to be replaced when it becomes contaminated Replace it only with the Hydrophobic Filter available from Arizona Instrument AZI Part No 990 0059 When replacing a filter it is good practice to flush the new filter with dry carrier gas to remove moisture adsorbed to the interior of the filter After replacing the filter on its holder replace the top cover before connecting the instrument to its power source Turn the instrument on and when READY TO TEST appears run the drydown procedure outlined on page 10 with a clean dry empty sample bottle When this procedure ends the system is ready for reuse O How do I change the filter A First obtain a replacement Hydrophobic Filter AZI Part Number 990 0059 There should be one in the accessory kit If none is found cal
29. llowing experiment 16 1 Set up the instrument to use time ending and set the time to 20 minutes 16 2 Pick an appropriate temperature See eak rate Determining the Test Temperature on page 17 25 D 16 3 Run a test and observe the peak rate WN 2 on the Rate Graph O Zis 16 4Use a rate ending value smaller than a AMEN El 1 3 the peak rate but larger than 0 2 1 i N 12 pear rate micrograms per second O ES M 16 5 Press Quit then Accpt EO E 5Press Quit then Z 0 50 100 150 200 250 16 6 Press Esc several times to return to the Main Test Menu and verify that e The name of the test appears next to TEST and e READY TO TEST appears in the status window at the bottom center of the screen sec Figure 17 Example of Graph 17 After determining the optimum test parameters repeat the test once to confirm the results 17 1 For performance data run 3 to 5 tests and determine the statistics by Select Stored Data from the Main Menu e Select Analyze Stored Data e Select the test results you want to analyze and e Press Calc Page 20 18 Tare weigh a clean empty sample bottle including the septum and cap Based on the expected moisture content of the sample determine optimum sample size using the chart on page 19 18 1 Weigh the loaded bottle and record the weight of the sample 18 2 Press START 18 3 When prompted enter the net sample weight and insert the bot
30. nd arrow keys to scroll through the alpha numeric characters The and gt arrow keys move the cursor s position left and right A Tip Use the arrow keys on the 101 key keyboard to navigate the menu system if it is included with your system The keyboard makes entry of long strings of characters such as product names easy since all the alphabetic and number keys can be used while editing 5 Enter the ID name then press Quit followed by Accept Page 16 6 1 6 2 6 3 Determining the Test Temperature Generally use the highest temperature possible without causing other undesirable conditions such as melting or excessive release of other volatiles The instrument is relatively insensitive to the exact temperature used Too low a temperature will result in slow tests and possibly low results It is important that the sample not melt in most cases A melted sample may form an impermeable skin and trap moisture producing a low result If the melting temperature is known use a temperature 10 or 20 degrees lower If it is not known start at a high temperature 230 to 270 and lower it until the sample no longer melts The following guidelines will help to determine test temperature If you have another moisture determination method reference method set the test temperature to the same temperature as used in your reference method Highlight the Temperatures on the Edit Memory Start Menu Press Selc
31. nstrument is ready for normal use Page 34 Q How do I change the injection port septum A This is a simple procedure First obtain a replacement septum There should be one in the accessory kit If none is found call AZI Customer Service at 800 528 7411 or 602 470 1414 for a replacement 1 Turn the instrument off and remove the power cord from its socket CAUTION Line voltage is present under the instrument s cover To prevent electrical shock turn off power and remove the power cord when instructed to do so Do not connect the power cord and turn power on until after the cover is secured in place 2 Inserta small probe into the hole at the back of the instrument see Figure 22 on page 33 It is marked by a graphic symbol indicating the method of opening the top cover Push inward to release the safety catch and lift the cover up with your free hand Remove it and put it in a safe place i Needle Guide 3 The injection port needle guide will be SN found near the front center on top of the Shipped with manifold assembly Use a 9 16 wrench to ag i loosen the nut Turn the nut _990 0058__ gt counterclockwise to remove it Lift off the needle guide and the nut The septum is sl now visible at the top of the injection port Replace it with a new one Replace the needle guide and nut hand tightening it Using the wrench turn the nut 1 4 turn to mi load the septum Grasp the needle guide F
32. nter to the parallel port on the back of the instrument Use the accessory printer from AZI or a standard PC graphics printer and cable Make sure the printer is supplied with paper the printer power is on and the printer is on line Go to Setup Menu and External Printer Setup Select the Printer Type and LPT port Go to Setup Menu Report Setup and Report Control Select text output Go to the screen showing Print and select the report to be printed Page 32 Routine maintenance consists of checking the filter for clogging or contamination checking the needles for clogs and cleaning of the flow path between the needle and the filter For clean samples such as most plastic resin pellets this is seldom necessary For very dusty samples it may be necessary more often CAUTION Line voltage is present under the instrument s cover To prevent electrical shock turn off power and remove the power cord when instructed to do so Do not re connect the power cord and turn power on until after the cover is secured in place To inspect the filter and tubing unplug the power cable Then insert a small probe into the hole at the back of the instrument It is marked by a graphic symbol indicating the method of opening the top cover Push inward to release the safety catch and lift the cover up with your free hand Remove it and put MODEL erate it in a safe place The filter is visible at x T10 ae 3040 right center above the manifo
33. p D Magazine as one of the 100 most technologically significant new products of 1997 A revolutionary moisture analyzer with a detection limit of 10 ppm the Computrac 3000 uses a sensor based technology and correlates to the Karl Fischer coulometric titration method with an oven attachment in precision and accuracy The analyzer does not utilize reagents minimizes consumables and is simple to operate 1997 Winner R amp D Magazine Technology 100 Award Principles of Operation The Computrac 3000 heats a sample of test material in a septum bottle Evolved volatiles are passed through a cold trap filter to an analysis cell where the moisture content of the flowing gas is measured A microprocessor integrates the varying moisture signal and converts the signal to micrograms of water for display Results are available in parts per million percent moisture or total micrograms of water Arizona Instrument s innovative prediction algorithm automatically terminates the test in just minutes when sufficient information is collected to allow accurate determination of the sample s moisture content The heating range of the Computrac 3000 is 25 C to 275 C Test parameters such as sample size heater temperature and test ending criteria can be altered to optimize speed and accuracy Performance Designed for either lab or production floor use the Computrac 3000 Moisture Analyzer uses patented state of the art technology specifically designed to pro
34. s copyright protected Copyright 1999 Arizona Instrument LLC All Rights Reserved Arizona Instrument LLC Computrac 3000 Moisture Analyzer Part Number 700 0020 Revision C1 February 1999 If you have any questions regarding the operation of this instrument please call our toll free number 800 528 7411 or fax 480 804 0656 Internationally call 602 470 1414 or from Canada call 800 528 7411 Arizona Instrument 3375 N Delaware St Chandler AZ 85225 USA http www azic com email azi azic com General intl azic com International support azic com Customer Support Page 45
35. selections Sensor Drydown high flow through the manifold and RH sensor but not the needle or bottle Standby normal flow through the manifold and RH sensor Bottle Purge high flow through the needle and bottle vented Sample Test low flow through all components bottle must be present System Purge high flow through all components bottle must be present Off returns the system to automatic control of the flow state NOTE If any manually controlled flow state is used ensure the manual flow control is set to off before attempting normal operation If this is overlooked an error message will be displayed on the main screen e VIEW SYSTEM EXCEPTIONS gt A list of the last 20 faults detected by the instrument diagnostic system Print the list and fax it to AZI Customer Service at 480 804 0656 to assist in diagnosis of possible system failure e PRINT EXCEPTION REPORT gt Prints the stored list of instrument diagnostic exceptions RTD stands for Resistive Temperature Detector and describes the solid state devices used throughout the instrument to measure temperatures Page 26 To assure proper performance your Computrac 3000 uses an intelligent self diagnostic system to detect any problems in the hardware software sensors or flow system Operating abnormalities and fault conditions will result in system failure codes or condition prompts They will be recorded in the Exception Reports table Condition prompts indic
36. ss Graph the Total Moisture Graph appears and the name above the arrow button changes to Next 3 2 Press Next the graph changes to display the rate at which moisture is passing over the sensor 3 3 Pressing Next will now toggle between the two graphs 4 To return to this Main Test Screen press Esc Page 22 5 Pressing Menu brings up a screen see Menu Overview Screen below showing the following options e MEMORY START MENU e STORED DATA MENU e CALIBRATION MENU e SETUP MENU e DIAGNOSTIC MENU MEMORY START MENU MAIN MENU MEMORY START MENU A ae STORED DATA MENU CALIBRATION MENU SETUP MENU TE ANALYZE STORED DATA ES REORDER STORED DATA DELETE STORED DATA DIAGNOSTIC CALIBRATION MENU PERFORM RH SENSOR CAL EDIT SYSTEM CAL CONSTANTS UIEW CALIBRATION STATUS PRINT CAL REPORT Select Down SETUP MENU VIEW SYSTEM SENSOR STATUS CLOCK SETUP tele ican MANUAL FLOW CONTROL MENU EXT BALANCE SETUP Selct Down VIEW SYSTEM EXCEPTIONS EXT PRINTER SETUP PRINT EXCEPTION REPORT REPORT SETUP ACCESS KEY SETUP SEPTUM RECORD SETUP Esc Down Figure 19 Main Menu Selections 6 Use the A and arrow keys to scroll through the selections and the and arrow keys to Escape or Select your choice Note that for some of the later selections the A and W arrow keys will cycle through available letters and numbers so that names can be spelled an
37. t then Edit Use the A and arrow keys to select the desired testing temperatures The 4 and gt arrow keys move the cursor s position When complete press Quit followed by Accept Page 17 9 Highlight the Result Display Option line 10 Press Select then Edit 10 1 Use the A and arrow keys to select the type of moisture value for the test result to be displayed Either e Percentage of water e Parts per million ppm of water or e Micrograms yg of water measured 11 Press the Quit then the Accept keys 0 Select How to End the Test 12 Highlight the Ending Criteria line 13 Press Selct then EDIT 13 1 Use the A and arrow keys to choose the type of ending value Rate ends the test when the moisture evolved from the sample drops below the programmed microgram per second value Use RATE if you want to match an existing standard or method that utilizes a RATE criteria such as the KF titration method This method is extremely dependent on the amount of sample used and water collected during a test For repeatability testing use a very consistent sample size that is within 0 2 gram e Predict ends the test when the built in programmed criteria which mathematically calculates the end point moisture content has been satisfied Use PREDICT if you want to more accurately determine the actual moisture content or are working independently of other standards or methods This potential calcul
38. tal base Lift the housing up and towards you and remove it from the chassis Store the cover in a safe place Page 38 10 Flow Regulator Adjustment Top Cover Latches w Megu a 7 Hi 8 2 N E ol 11 Da 5570 CW to increase flow 12 HI6 O COW to decrease flow Figure 30 Cover Latches and Flow Regulator Adjustment Locations Set the output flow for 100 ml min measured on the flow meter e Slowly Adjust the screw on top of the Inlet Flow Regulator CLOCKWISE to increase and COUNTERCLOCKWISE to decrease the flow until the flow meter indicates 100 ml min 11 Connect the power cord to the source of power and turn the instrument on 12 Go to the Diagnostics Menu 13 Select View System Sensor Status 14 Read and record the exact outlet flow rate as SENSOR STATUS indicated by the flow meter eg oc ER mL Min 15 Read and record the instruments indicated eg Flow Out from the display gt C 16 Divide the Measured Outlet Flow Rate by the Instruments Indicated Flow Out and multiply the result by 100 to determine the Flow HSHEe di Sensor Siams Display Calibration Factor FCF Measured Flow Out Rate x 100 Flow Out FCF Indicated Flow Out Rate 16 1 Example
39. the aid of a small screwdriver to release the lever Do the same to the latch on the near side Holding the top of the injection port rotate the manifold up and out of the instrument Rotate the manifold to allow the needle to clear the opening in the tube oven Figure 27 Manifold Removal 10 Set the removed manifold aside Page 36 11 12 13 14 15 16 Inspect the two openings in the manifold mount to be sure that the small sealing o rings have not become dislodged Unpack the replacement manifold and install it by reversing the procedure above Replace the top cover connect the dry air gas source and the power cable Figure 28 Manifold Turn the instrument on and wait a few minutes for it to O Rings warm up Go to the diagnostic menu and check the gas flows e Ifthey are different by more than a few percent there may be a leak e Ifso loosen the manifold latches check the o rings reseat the manifold and try again Once installed the manifold and associated sensor must be calibrated Enter the two constants from the manifold sensor card e Perform the water injection calibration procedure Page 37 Q How do I Calibrate the Flow Sensors A Follow the steps listed below A calibrated flow meter that will measure a flow rate of 100 ml min is required 1 Verify the pressure of the dry gas supplied to the instrument is between seven 7 and twelve 12 psi 9 to 10 psi is preferre
40. the blinking message HAND INJECT WATER NOW e When prompted by the instrument place the needle tip in the injection port at the top of the instrument and insert it straight down until the septum is contacted Push it in until it touches the bottom of the injection port e Release the silver button on the lower Chaney fitting just prior to injecting the sample into the unit e Once the silver button is released inject the 0 5 uL sample by depressing the plunger fully with a firm smooth stroke By doing so all sample is dispensed since the plunger wire acts as a positive displacement device terminating at the end of the needle e Remove the needle from the injection port immediately Allow the test to proceed until completed It should take less than 3 minutes If desired perform four more calibration injections and calculate the statistics for the water injection results for instant performance analysis e After the fifth injection test press Menu for MAIN MENU e Press Select for STORED DATA MENU e Press Selct for ANALYZE STORED DATA e Highlight and Selct the desired results to be included in the statistics and e Press STAT to calculate Average Standard Deviation and Coefficient of Variation The average should fall within 5 of the calibrated syringe s value If the mean result does not fall within the 5 range a sensor calibration should be performed Page 13 NOTES e Only a one microliter
41. tle The system will purge the bottle for The accessory balance AZI 28 seconds The sensor will again zero and the test P N Y990 0082 eliminates begins possible transcription errors when entering the sample 18 4 An audible beep will sound when the instrument has Weight Itis also faster than completed the test Use the table on page 19 and the manually taring and FINAL moisture reading on the display to adjust the weighing the sample sample size accordingly to optimize test time repeatability and accuracy Page 21 COMPUTRAC 3000 MENU SYSTEM 1 Inthe idle state the Main Test Screen displays menu access keys at the bottom From left to right they are e Memry key for accessing stored memory start selections e Menu key for accessing the Main Menu and e Graph key which changes the display to a graph of collected moisture and rate information 2 Use either the and gt or A and arrow keys to make your selection Data from the OFF Last Test LAST ast les FINAL 966606 PPM H20 J OTAL 6666 6 pg H20 TIME 66 66 66 Current Sensor RH SENSOR CAL Status SELECTS PRESS MEMRY READY TO TEST 825 To Select Another Memry Menu Graph Set of Stored Test Parameters View Test s Graphical Data To Access the Main Menu Options Figure 18 Main Test Screen Current Oven Temperature 3 The Graph key can be used to switch the display to the graphical displays 3 1 Pre
42. tly improve accuracy and will only add to the test time Smaller quantities will result in faster tests but may degrade accuracy depending on the properties of the sample No damage to the instrument will ensue if samples are too small but samples that evolve more than about 10 000 micrograms of water or other volatiles may result in condensation of water or volatiles in the output flow sensor damaging it 15 3To estimate sample size you must have some idea of the approximate moisture content of the sample Use the calculation shown below to estimate the minimum sample size 0 05 Expected Moisture Minimum Sample Grams 500ug water Example Expected Moisture is 0 05 Minimum Sample 0 05 05 1 0 grams Page 19 15 4Similarly the maximum sample is determined by what size sample will release 1000 micrograms of water 0 1 1000 t Expected Moisture ug water Maximum Sample Grams Example Expected Moisture is 0 05 Maximum Sample 0 1 05 2 0 grams 15 5 These are only guidelines Experiment with your sample to refine the size estimates to achieve your desired speed and accuracy Note that if you are using a rate ending criterion and the peak moisture rate is less than 5 times the rate threshold the sample sizes should not be allowed to vary more than about 10 Larger variation of sample size will lead to a larger variation of results 16 Ifyou are not trying to match KF analysis results perform the fo
43. uL of sample pull the plunger past the 0 5 uL graduation while the needle is immersed in the sample The rod which goes through the lower Chaney fitting by the flange willbe C 27nn drawn through the hole in this fitting Figure 9 Drawn Position e Press in on the silver button on this lower Chaney fitting to close the hole e Depress the plunger until the rod touches the closed hole in the pr TT lower Chaney fitting Hold the button in and the plunger against the stop untill the syringe is fully seated in the instrument s injection Y port gt To prevent loss of water from the syringe by capillary action do not touch the needle tip to anything until it is inserted into the calibration port of the instrument Figure 10 Silver e When prompted by the instrument place the needle tip in the Button Depressed injection port at the top of the instrument and insert it straight and Rod Against down until the septum is contacted Push the syringe in until the Stop needle touches the bottom of the injection port Page 11 Figure 11 Correct Placement Figure 12 Incorrect Placement e Release the silver button on the lower Chaney fitting and inject the 0 5 uL sample by depressing the plunger fully with a firm smooth stroke By doing so all sample is dispensed since the plunger wire mm acts as a positive displacement device terminating at the end of the needle e Remove the needle from the injection port immediately F
44. ug H2O CAL MASS 0507 8 ug H2O f COFF OF VAR 01 50 14 Press Go The screen will appear CALCONST 88 similar to the illustration at right HIT ACCPT TO SAVE CAL DATA 15 Press Acept to save the new HIT QUIT TO DISCARD CAL DATA calibration constant Sample Calibration Display 16 The new calibration constant will remain in memory until the next sensor calibration is performed The injections used for this calibration will be automatically deleted so they will not be used for the next calibration 17 Press the Esc key twice and the Main Test Screen appears 18 Perform at least one more water injection to verify the accuracy of the calibration Page 15 The Computrac 3000 has eight available positions to store test parameters for different materials Storing the parameters ensures that each test of the same material will use the same parameters to assure accurate reliable and repeatable testing MAIN MENU MEMORY START MENU STORED DATA MENU CALIBRATION MENU 3 SETUP MENU 1 From the Main Menu select Memory Start Menu DIAGNOSTIC MENU Esc Selct Down Figure 15 Memory Start Menu 2 From the Memory Start Menu select Add Edit ADD EDIT MEMORY START REORDER MEMORY START PRINT MEMORY STARTS Memory Start 3 Move the cursor down to an available memory start setting a blank line Esc Select Down Figure 16 Memory Start Menu 4 Press Select then Edit at the Edit Sample ID line 4 1 Use the A a
45. vide accurate and precise results in a timely manner This ensures that product quality is achieved and maintained The Block 2 design features faster tests lower background moisture levels and more accurate performance at the lowest moisture levels The Computrac 3000 stores programed memory settings for up to seven materials and retains the data from the last 30 sample test runs The software automatically calculates the statistics of any selected stored data upon demand All retained test data can be automatically sent to an external printer or personal computer at the end of a test or on request A factory calibrated syringe provided in the accessory kit permits quick and easy system verification System calibration is checked in just minutes Re calibration is a menu driven two step procedure to assure accurate and reliable results day after day Built in self diagnostics constantly monitor system conditions to detect and report any abnormalities in the hardware software moisture sensor or flow system Page 4 The Computrac 3000 utilizes a cylinder shaped bottle heater a dry gas flow system and a moisture sensor The instrument heats a sample of test material contained in a 20 ml milliliter septum bottle Volatiles driven from the sample pass through the manifold containing the Relative Humidity RH sensor where the evolved moisture is measured A microprocessor uses the collected data to generate an accurate measurement of the moistur
46. water Depress the plunger all the way down Slowly withdraw the plunger to the stop Rapidly depress the plunger all the way and observe the needle tip for small bubbles If any appear repeat the cycle until none appear Slowly withdraw the plunger to the stop and hold it against the stop while withdrawing the needle from the septum To prevent loss of water from the syringe by capillary action do not touch the needle tip to anything until it is inserted into the calibration port of the instrument Start a RH SENSOR CAL see page 12 When prompted by the instrument place the needle tip in the injection port at the top of the instrument and insert it straight down until the septum is contacted Push it in until it touches the bottom of the injection port Be careful not to move the plunger while inserting the needle Depress the plunger all the way with a firm smooth stroke Remove the needle from the injection port immediately Page 31 Store the needle in a dry place A desiccator box is a good choice If water is allowed to remain in the needle it will cement the needle bore and plunger wire together If this happens do not force the plunger to move as this will break the wire Instead insert the needle into the water bottle and let it soak for 15 minutes or until it moves freely If the syringe is damaged or is in need of annual calibration contact Customer Service at 800 528 7411 or 602 470 1414 for a replacement After receivin
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